 The range of <offset> is related to the current mode of the horizontal
timebase (refer to :TIMebase:MODE) and run state of the oscilloscope.
― YT mode
RUN: (-0.5 x MemDepth/SampleRate) to 1s (when the horizontal
timebase is less than 200ms/div)
(-0.5 x MemDepth/SampleRate) to (10 x MainScale) (when the
horizontal timebase is greater than or equal to 200ms/div, namely
the "Slow Sweep" mode)
STOP: (-MemDepth/SampleRate) to (1s + 0.5 x MemDepth/SampleRate)
― Roll mode
RUN: This command is invalid.
STOP: (-12 x MainScale) to 0
Wherein, MemDepth is the current memory depth of the oscilloscope,
SampleRate is the current sample rate of the oscilloscope, and MainScale is the
current main timebase scale of the oscilloscope.
 When the horizontal timebase mode is YT and the horizontal timebase is
200ms/div or larger (namely the "Slow Sweep" mode), this command is invalid
when the oscilloscope is in the transition to the "Stop" state.
:TIMebase:MAIN:OFFSet 0.0002 /*Set the main timebase offset to 20ms*/
:TIMebase:MAIN:OFFSet? /*The query returns 2.0000000e-04*/